超大直径盾构下穿施工引起既有地铁隧道变形分析及控制要点  

Analysis and Control Points of Existing Metro Tunnel Deformation Caused by Super-large-diameter Shield Under-passing Construction

作　　者：周群 邵华 李家平 ZHOU Qun;SHAO Hua;LI Jiaping(Shanghai Metro Maintenance Support Co.,Ltd.,200235,Shanghai,China;Shanghai Metro Monitoring Management Co.,Ltd.,200070,Shanghai,China;Shanghai Engineering Research Center of Geotechnical Test for Underground Space,200093,Shanghai,China)

机构地区：[1]上海地铁维护保障有限公司,上海200235 [2]上海地铁监护管理有限公司,上海200070 [3]上海岩土与地下空间综合测试工程技术研究中心,上海200093

出　　处：《城市轨道交通研究》2024年第S01期79-83,共5页Urban Mass Transit

基　　金：上海市科技创新行动计划技术标准项目(22DZ2206200);上海申通地铁集团有限公司科研项目(JS-KY22R005-3)。

摘　　要：[目的]随着城市地下空间利用率不断提高,新建隧道穿越施工对既有隧道的扰动不可避免。上海市北横通道超大直径盾构近距离下穿上海轨道交通11号线工程项目情况较为复杂,需针对性分析对既有隧道变形的影响。[方法]基于上海轨道交通11号线上下行线隧道的实时监测数据,分析了北横通道超大直径盾构下穿隧道影响区域时,11号线上下行线隧道垂直位移情况;提出了下穿施工期间控制既有地铁隧道变形的技术要点。[结果及结论]盾构下穿施工对既有地铁隧道垂直位移影响主要发生在正投影区域,且垂直位移曲线呈现“火山口状”;在正常下穿施工阶段上方既有地铁隧道表现为上抬,而在管片拼装阶段则表现为下沉。应基于“少扰动、小扰动”的原则采取控制既有地铁隧道变形的技术措施。[Objective]With the continuous increase in the utilization rate of urban underground space,the under-passing construction of new tunnels inevitably disturbs existing tunnels.The project situation of Shanghai Beiheng Passage super-large-diameter shield under-passing Shanghai Rail Transit Line 11 in proximity is complicated,requiring a targeted analysis of the impact on the deformation of existing tunnel.[Method]Based on real-time monitoring data of the upward and downward tunnels of Shanghai Rail Transit Line 11,the vertical displacement of Line 11 upward and downward tunnels during Beiheng Passage super-large-diameter shield under-passing tunnel impacted area is analyzed,and the technical points for controlling existing metro tunnel deformation during the under-passing construction are proposed.[Result&Conclusion]The impact of shield under-passing construction on the vertical displacement of existing metro tunnel mainly occurs in the orthographic projection region,with the vertical displacement curve showing a′volcano-like′shape.During normal under-passing construction phase,the above existing metro tunnel exhibits uplift,while during segment assembly,it exhibits subsidence.Technical measures should be adopted based on the principle of′less disturbance,minimal impact′to control the deformation of existing metro tunnel.

关 键 词：地铁隧道 超大直径盾构 近距离下穿 变形影响 

分 类 号：U456.3[建筑科学—桥梁与隧道工程]